# std::generator<Ref,V,Allocator>::promise_type

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< cpp‎ | coroutine‎ | generator

class generator<Ref, V, Allocator>::promise_type; |  | (since C++23)

The promise type of `std::generator`.

### Data members

Member | Description
std::add_pointer_t<std::generator::yielded> `value_` | A pointer to the yielded value. Default value is nullptr. (exposition-only member object*)
std::exception_ptr `except_` | A pointer to an exception object. (exposition-only member object*)

### Member functions

(constructor) (implicitly declared) | constructs the `promise_type` object (public member function)
(destructor) (implicitly declared) | destroys the `promise_type` object (public member function)
get_return_object | issues the generator object (public member function)
initial_suspend | issues an awaiter for initial suspend point (public member function)
final_suspend | issues an awaiter for final suspend point (public member function)
yield_value | processes the object obtained from co_yield (public member function)
await_transform [deleted] | maps the object obtained from co_await to an awaiter (public member function)
return_void | handles co_return; or the exit out of coroutine's body (public member function)
unhandled_exception | processes exceptions that leaked from the coroutine's body (public member function)
operator new [static] (C++23) | allocates memory using `Allocator` (public static member function)
operator delete [static] (C++23) | deallocates memory previously obtained from `operator new` (public static member function)

### Example

| This section is incomplete Reason: no example

### See also

noop_coroutine_promise (C++20) | used for coroutines with no observable effects (class)

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